TW594106B - Thin direct-type backlight module - Google Patents

Abstract

A direct-type backlight module is disclosed, which at least comprises: a lamp tube, a reflective plate, diffusion plate, reflective layer. The reflective plate is installed below the lamp tube. The diffusion plate is installed above the lamp tube, which comprises a first region and a second region. The first region is corresponding to the upper surface of the lamp tube, the second region is adjacent to the first region. The reflective layer covers the upper surface of the lamp tube locally to shield part of the light emitted from the shielded part, so that the light is reflected onto the reflective plate, and is reflected again onto the second region by the reflective plate.

Description

594106 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a direct type backlight module, and more particularly to a thin direct type backlight module. [Previous technology] With the booming development of the global liquid crystal display technology (LCD) industry, the application level of panel products continues to increase, and lighter and thinner products continue to be introduced. A backlight module, one of the key components, has also developed rapidly in terms of technology and manufacturing processes to provide a light source for LCD panel users. According to the position of the light source, the backlight module can be divided into edge type and direct type; the lamp tube of the side type backlight module adopts single or bilateral setting, and guides the light through the light guide plate. The scattering direction provides a planar light source, and the direct type backlight module has a plurality of light tubes, which are arranged in parallel to the bottom of the light box, so that the light source directly projects upward to the upper diffuser plate. Due to the low brightness of the side-type backlight module, it is more suitable for light, thin and short products. For larger products, direct-type backlight modules are required to provide sufficient brightness. However, direct-type backlight modules are common. The problem is that the thickness is too thick, and if you want to reduce the overall thickness in the design, it will affect the uniformity. Please refer to Fig. 1 for a side view of a conventional direct type backlight module and its corresponding luminance value. The direct type backlight module has a light box, and the light box 100 has a plurality of lamp tubes 102. The lamp tube 102 is fixed with silicon rubber (silicone rubber) at both ends in the light box 100, and the lamp tube 102 is evenly arranged 594106.

It is placed on the back of the liquid crystal surface. ^ Sufficient backlight,…, so that the entire LCD panel can have a vertical light ′ ”to display better display quality. The brightness of the direct-type backlight module is measured in the direction of the upper curve in the upper figure of Fig.1. The brightness value of the direct-type backlight module is measured in the direction of Γ, and a straight chart is displayed to show the corresponding brightness values of ^ groups at different positions. The two adjacent lamps of the direct type backlight module are directed to 102b. Schematic diagram of the divided light path. In the second figure, the lamp tube 102a has a region, and the upper region is more active than the upper region 5 between the two lamps 102a and 102b, so the light intensity is also higher. Therefore, the corresponding luminance value of the area directly above the lamp tube is higher than that of the upper area between the lamp tube and the lamp tube, and with different positions of the direct-type backlight module, a waveform curve as shown in FIG. 1 is displayed, where The luminance value is between bl and b2, which makes the planar light source produce unevenness between light and dark. The light bulb is brighter directly above the lamp, and the light bulb is darker. In particular, as the thickness of the direct type backlight module is thinner, the larger the difference between b 1 and b 2 will make the above phenomenon particularly obvious, which seriously affects the uniformity of the direct type backlight module. [Summary of the Invention] In view of this, the object of the present invention is to provide a binding type direct-lit backlight module on a board to improve the uniformity of the direct-lit backlight module, thereby effectively reducing the overall thickness. According to the purpose of the present invention, a direct-lit backlight module is provided, which at least includes a lamp tube, a reflection plate, a diffusion plate, and a reflection layer. The reflecting plate is arranged below the lamp tube; the diffuser plate is arranged above the lamp tube, including-a first region and a second region, wherein the first region corresponds to the upper surface of the lamp tube,

Page 5 TW1049F (Chimei). Ptd 594106 V. Description of the invention (3) The first area is adjacent to the first area; the reflective layer partially covers the upper surface of the lamp tube to shield part of the light emitted from the upper surface, and The light is reflected to the reflecting plate, and the light is reflected to the second area through the reflecting plate. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible ', a preferred embodiment is given below, and in conjunction with the accompanying drawings, the detailed description is as follows: [Embodiment]

The invention treats the upper surface of the lamp tube, and applies a layer of reflective material to make part of the light emitted directly above the lamp tube reflect downward first, and then the light is reflected twice by the reflecting plate below the lamp tube. Reflected to the area between the tube and the tube; under the condition that the light energy is not changed, a part of the light emitted directly above the tube is dispersed to the area between the tube and the tube by using the reflection process.

Please refer to FIG. 3, which illustrates a perspective view of a thin plasticized direct type backlight module according to a preferred embodiment of the present invention. The thin direct type backlight module includes a light box 300, and the light box 300 has a plurality of surface-treated lamps 302. FIG. 4 is a schematic view showing a part of the light path of the thin direct-lit backlight module of FIG. 3, which emits upwards. Please refer to FIG. 3 and FIG. 4 at the same time, the reflection plate 3 06 is disposed on the inner bottom surface of the light box 300, and the two adjacent light tubes 302a and 302b are disposed parallel to the reflection plate 306 and the diffusion plate 3 08. Below. The lamps 30 2 a and 30 2b have upper surfaces 30 4a and 30 4b, respectively. The diffuser plate 308 includes first regions A and B and second regions N1, N2, and N3. The first regions A and B correspond to the lamps 302a and 302b.

TW1049F (Chimei) .ptd Page 6 594106 V. Description of the Invention (4) The upper surface, and the second regions N1, N2, N3 are adjacent to the first regions A, B. As shown in Fig. 4, the lamp tubes 302a and 302b have reflective layers 304a and 304b after surface treatment, and partially cover the upper surfaces of the lamp tubes 302a and 302b to shield part of the light rays La and Lb emitted from the upper surface. Take the lamp tube 3 0 2 a as an example, in which the upwardly radiating light La corresponding to the first area A is first shielded by the reflective layer 304 a and reflected downward to the reflective plate 306, and then the light La is reflected to the first through the reflective plate 306. Two regions N2; according to this, the light tube La emitted from the tube 302a directly upward and corresponding to the first region A, the brightness value of the light tube directly above the tube 302a is reduced by the shielding of the reflective layer 304a, and the light energy being masked The secondary reflection process is dispersed to the second region N2 between the tube and the tube, so that the luminance value of the upper region between the tube and the tube is increased, thereby reducing the maximum luminance value b 1 and the minimum luminance value b. The difference between the two. Therefore, through the design of the present invention, under the condition that the total light energy is maintained, a part of the light emitted directly from the lamp tube is dispersed to the area between the lamp tube and the lamp tube by the reflection process, so that the light emitted by the lamp tube The light can be distributed more evenly on the diffuser. Please refer to Figs. 5A and 5B for a partial enlarged view of region R in Fig. 3. The reflective layer that partially covers the upper surface of the lamp tube 3 2 includes several reflection units' to shield part of the light emitted from the upper surface of the lamp tube 302, so that the light is dispersed to the lamp tube 3 by the reflection process. Side space. The material of the reflection unit is a metal compound, which can be preferably coated on the upper surface of the lamp tube by a sputtering method of vacuum plating. The reflective units are covered in a discontinuous manner on the upper surface of the lamp tube 3, and can be attached in a discrete distribution or spaced arrangement to avoid the possibility of leakage. And the reflection unit itself

7 Page 7 TW1049F (Chimei) .ptd 594106 5. The thickness of the invention (5) or reverse adjustment. Reflection The shape, size, and adjustment shown in Figure 5B to maintain the overall thickness of the lamp surface-type backlight module. In summary, it is not the preciseness of the invention that is based on the precision of the present invention. The degree of denseness between the radiation units needs to be determined by the thickness of the light box. The appropriate unit is preferably a circular structure as shown in Figure 5A. 5 0 2 ， 之 条条 结构 504。 However, it is not limited to this, other reflective units of different density can be based on the actual effect or demand to maintain the uniformity within an acceptable range. In particular, the method for directly covering a layer of reflective material in the present invention can effectively improve the uniformity of the direct downward, and further reduce the design of the direct-type backlight module, and provide a thin uniform direct-type light box with improved uniformity. Although the present invention The above has been disclosed with a preferred embodiment to limit the present invention. Any person skilled in this art can make various modifications and retouching without departing from the scope of God. Therefore, the scope of protection shall be regarded as the scope of the attached patent application. Defined by

TW1049F (Chimei) .ptd Page 8 594106 Brief description of the drawing [Simplified description of the drawing] Fig. 1 shows a side view of a conventional direct type backlight module and its corresponding luminance value. Fig. 2 is a schematic view showing a part of the light path of the lamp tube of the direct type backlight module in Fig. 1 which projects upward. FIG. 3 is a perspective view of a thin direct-lit backlight module according to a preferred embodiment of the present invention. FIG. 4 is a schematic view showing a part of the light path of the thin direct-lit backlight module of FIG. 3, which is directed upward. Figures 5A and 5B are partial enlarged views of region R in Figure 3. Description of the drawing symbols 1 0 0, 3 0 0Light boxes 102, 102a, 10 2b, 302, 302a, 302b: Light tube 30 4a, 3 04b: Reflective layer

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Claims (1)

594106 VI. Application for patent scope 1. A direct type backlight module, which includes at least a lamp tube with an upper surface; a reflecting plate disposed below the lamp tube; a diffuser plate disposed above the lamp tube, A second region, wherein the first region corresponds to a surface, and the second region is adjacent to the first region; a reflective layer partially covers a light emitted from the upper surface of the upper part of the lamp tube, to Make the light plate, and then reflect the light to the 2 through the reflection plate. As described in item 1 of the patent application scope, the reflection layer includes a plurality of reflection units, wherein the upper surface is covered in a discontinuous manner. 3. The reflecting units as described in item 2 of the scope of patent application are discretely distributed on the upper surface. 4. The reflecting units as described in item 2 of the scope of patent application are spaced on the upper surface. 5. The reflective layer is a metal compound as described in item [Scope of the patent application]. 6. As described in item 1 of the scope of patent application, the reflective layer is vacuum-plated on the upper surface. 7. The reflective layer is sputtered on the upper surface as described in item 6 of the scope of patent application. 8. A thin, straight-down type light box, comprising a reflecting plate, which is arranged on the inner bottom of the light box and includes a first area, the lamp tube and a surface, and a linear reflection second area. The upper surface of the bottom surface is used to shield the part to the reflection area. Optical module, its transmission unit is optical module, its optical module, its optical module, its optical module, its optical module, its surface; TW1049F (Chimei) .ptd Page 10 594106 Scope ^ A plurality of lamps are arranged in parallel above the far-reflecting plate. Among them, three female lamps further include a reflective layer, wherein the reflective layer partially covers an upper surface of each of the lamps to cover a part A light beam is emitted from the upper surface, so that the light beam is reflected to the reflecting plate, and then the light beam is reflected into the space between the lamp tubes through the reflecting plate. 9. The light box according to item 8 of the scope of patent application, wherein the reflective layer includes a plurality of reflective units, wherein the reflective units are discontinuous, which are reflected in the reflection, which are reflected in the reflection, Wherein the reflection, wherein the direct type covers the upper surface. 10. The light box 'emitting units as described in item 9 of the scope of patent application are discretely distributed on the upper surface. + 11. The lamp 1 sighting units as described in item 9 of the scope of patent application are arranged on the upper surface at intervals. X 12. The lamp phase layer as described in item 8 of the scope of patent application is a metal compound. 13. The lamp phase layer as described in item 8 of the scope of patent application is vacuum-plated on the upper surface. I. Less, inter-box 14. The layer is sputtered on the upper surface as described in item 13 of the scope of patent application. # 15. —A type used in a direct-lit backlight module under the second group. The tube-type backlight module includes a reflective plate, which is disposed on the lamp including an upper surface, so that the light is reflected to the plurality of reflection units. Scattered Brigade Attachments: 2: A light emitted from the upper surface by the obscured part TW1049H Chimei) .ptd Page 11 594106 6. Scope of patent application Reflector, and then reflect the light to the side space of the lamp through the reflector. Wherein the reflection Where the reflection Where the reflection Where the reflection Where the reflection 16. The tube unit according to item 15 of the scope of patent application has a circular structure. 17. The lamp unit described in item 15 of the scope of patent application is a strip structure. 18. The material of the lamp unit described in item 15 of the scope of patent application is a metal compound. 19. The lamp tube unit described in item 15 of the scope of patent application is vacuum-plated on the upper surface. 2 0. The lamp tube unit described in item 15 of the scope of patent application is sputter-plated on the upper surface. TW1049F (Chi Mei) .ptd 12 pages